A green checkmark in a box — the most universally recognized "done," "correct," or "approved" emoji, ubiquitous in to-do lists, fact-check-style captions, and agreement replies. Its green color and boxed shape make it instantly parseable at a glance, which is likely why it became one of the most-used emoji across every platform globally.
Keywords: ✓, button, check, checked, checkmark, complete, completed, done, fixed, mark, tick